On Wed, 3 Oct 2007, David Miller wrote:
> > there is still code that does DMA from and to the stack....
> > how would this work with virtual allocated stack?
>
> That's a bug and must be fixed.
>
> There honestly shouldn't be that many examples around.
>
> FWIW, there are platforms using a virtually allocated kernel stack
> already.
There would be a way to address this by checking in the DMA layer for a
virtually mapped page and then segmenting I/O at the page boundaries to
the individual pages. We may need that anyways for large block sizes.
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